Escaping geodesics in Riemannian surfaces with variable negative curvature
Sign Up to like & getrecommendations! Published in 2019 at "Advances in Mathematics"
DOI: 10.1016/j.aim.2019.01.032
Abstract: Abstract In this paper we give a lower bound for the visual Hausdorff dimension of the geodesics escaping through different ends of Riemannian surfaces with pinched negative curvature. This allows to show that in any… read more here.
Keywords: negative curvature; surfaces variable; escaping geodesics; curvature ... See more keywords
Effect of tube wall thickness on the confinement loss, power fraction and bandwidth of terahertz negative curvature fibers
Sign Up to like & getrecommendations! Published in 2019 at "Optik"
DOI: 10.1016/j.ijleo.2018.10.067
Abstract: Abstract We treat numerical simulations to investigate how the tube wall thickness affects the confinement loss, power fraction ratio and bandwidth of terahertz (THz) negative curvature fibers at the frequency of 2.52 THz. The frequency of… read more here.
Keywords: confinement loss; negative curvature; tube wall; curvature fibers ... See more keywords
Non-Negative Curvature, Elliptic Genus and Unbounded Pontryagin Numbers
Sign Up to like & getrecommendations! Published in 2018 at "Proceedings of the Edinburgh Mathematical Society"
DOI: 10.1017/s0013091517000025
Abstract: Abstract We discuss the cobordism type of spin manifolds with non-negative sectional curvature. We show that in each dimension 4k ⩾ 12, there are infinitely many cobordism types of simply connected and non-negatively curved spin… read more here.
Keywords: negative curvature; elliptic genus; curvature elliptic; genus unbounded ... See more keywords
Study on the high birefringence and low confinement loss terahertz fiber based on the combination of double negative curvature and nested claddings
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Physics D: Applied Physics"
DOI: 10.1088/1361-6463/ac4136
Abstract: A novel double negative curvature nested fiber structure is designed by adding extra circular cladding tubes to enhance the birefringence and reduce the confinement loss. The fiber structure is composed of eight circular cladding tubes… read more here.
Keywords: negative curvature; double negative; birefringence; curvature nested ... See more keywords
Quantum complexity and negative curvature
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.95.045010
Abstract: As time passes, once simple quantum states tend to become more complex. For strongly coupled k-local Hamiltonians, this growth of computational complexity has been conjectured to follow a distinctive and universal pattern. In this paper… read more here.
Keywords: negative curvature; quantum complexity; complexity; complexity negative ... See more keywords
Negative curvature hollow-core anti-resonant fiber for terahertz sensing.
Sign Up to like & getrecommendations! Published in 2020 at "Applied optics"
DOI: 10.1364/ao.395914
Abstract: Hollow-core fibers are advantageous for chemical sensing as they facilitate liquid infiltration into the core over conventional porous core fiber. In addition, the requirement of less bulk material significantly decreases the effective material loss (EML).… read more here.
Keywords: negative curvature; hollow core; curvature hollow; fiber ... See more keywords
Modal content measurements (S2) of negative curvature hollow-core photonic crystal fibers.
Sign Up to like & getrecommendations! Published in 2017 at "Optics express"
DOI: 10.1364/oe.25.003006
Abstract: We present modal content measurements (S2) of two different negative curvature hollow-core photonic crystal fibers: a kagome fiber and an ice cream cone fiber. Their sensitivity towards mode matching, bending and polarization is analyzed. For… read more here.
Keywords: negative curvature; hollow core; core photonic; content measurements ... See more keywords
Ultralow loss hollow-core negative curvature fibers with nested elliptical antiresonance tubes.
Sign Up to like & getrecommendations! Published in 2022 at "Optics express"
DOI: 10.1364/oe.454263
Abstract: Hollow-core negative curvature fibers can confine light within air core and have small nonlinearity and dispersion and high damage threshold, thereby attracting a great deal of interest in the field of hollow core fibers. However,… read more here.
Keywords: core negative; loss; hollow core; negative curvature ... See more keywords
Optofluidic laser based on a hollow-core negative-curvature fiber
Sign Up to like & getrecommendations! Published in 2018 at "Nanophotonics"
DOI: 10.1515/nanoph-2018-0014
Abstract: Abstract An optofluidic laser based on a hollow-core negative-curvature fiber (HC-NCF) is proposed and demonstrated. The submicron-thick circular capillary tubes embedded in the cladding of the HC-NCF act as antiresonant elements and are used as… read more here.
Keywords: optofluidic laser; negative curvature; hollow core; based hollow ... See more keywords
Surfaces with Constant Negative Curvature
Sign Up to like & getrecommendations! Published in 2023 at "Symmetry"
DOI: 10.3390/sym15050997
Abstract: In this paper, we have considered surfaces with constant negative Gaussian curvature in the simply isotropic 3-Space by defined Sauer and Strubeckerr. Firstly, we have studied the isotropic II-flat, isotropic minimal and isotropic II-minimal, the… read more here.
Keywords: constant negative; isotropic; negative curvature; curvature surfaces ... See more keywords
Femtosecond pulse compression using negative-curvature hollow-core fibers
Sign Up to like & getrecommendations! Published in 2019 at "Chinese Optics"
DOI: 10.3788/co.20191201.0075
Abstract: In order to compress femtosecond ultrashort pulses, a novel fiber called negative-curvature hollow-core fiber, is investigated and is used to compress the output of a Ti:Sapphire laser. Firstly, a hollow-core fiber with circular tubes cladding… read more here.
Keywords: curvature hollow; negative curvature; core; hollow core ... See more keywords